Spinel fire-brick.



N0 Drawing.

gran ears rnrnn'r I CHARLES ALFRED MANKAU, OF ST. PETERSIBURG, RUSSIA.

SPINEL FIIEtE-IBRIIGK.

emons.

Specification of Letters Patent.

the refractory materials of which the bricks are made. i

According to my invention I employ as a ccm'entitious orbinding material for uniting'the particles vof refractory material a small proportion of the mineral natural spinel consisting of a combination of oxids of which MnOALQ, is a type; Such a combi nation of OXidSliS hereinafter referred to as spinel. The proportion of spinel I employ is from three to six per cent. of that of the refractory material forming the bod of the brick, and a brickroducedaccor ing to my invention thus di ers from previously known bricks which were composed of from 40 to 90 per cent. of natural and artificial spinel with an admixture of refractory material. 1 v v The refractory materials'employed in my I improved bricks are those which are well nesite, and the like.

The refractory materials for the firebrick admixed with spinel are, in carrying this invention into effect, subjectedto a white heat temperature by which perfectly cemented firebrick is obtained. I prefer to add a small proportion of bauxite or a mineral of a like nature to corundum to the refractory materials. The firebrick thus obtained may be reground mixed with tar, pitch or the like and be formed or pressed into crucibles or other articles and be again calcined. What I claim is: J

l. A firebrick composed of refractory ma- \terials and a binding material therefor comprising a small percentage of spinel.

2. A firebrick composed of refractory materials and a binding material therefor comprising a small percentage of spinel, the

percent. of that of the refractory materials.

name to this specification in the presence of two subscribing WltIlGSSGS;

' A. TSCHERALOFF.

Patented Oct. 14, 1913.

Application filed July 5,1910 Serial No. 570,399.

known for the purpose of making refractory bricks, such for example as dolomite, ma'g- In testimony whereof I have signed my 5 proportion of spinel being from three to six 

